Theoretical and practical implications of creep curve shape analyses for 7010 and 7075 |
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Authors: | H Burt and B Wilshire |
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Affiliation: | (1) Materials Research Centre, School of Engineering, University of Wales, SA2 8PP Swansea, UK |
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Abstract: | Over tensile stress ranges giving creep lives up to 2000 hours at 373 to 463 K, the creep and creep fracture properties of
7010 are compared with results recorded for 7075 and other precipitation-hardened aluminum alloys. Using the ϕ methodology
to quantify the systematic variations in creep curve shape with changing test conditions, the behavior patterns displayed
by the different alloys are shown to depend on the extent to which precipitate coarsening causes a progressive loss of creep
strength with increasing test duration and temperature. The ϕ relationships also introduce new approaches for rationalization
and interpretation of creep data sets, based on the activation energy for lattice diffusion in the alloy matrices and the
yield stress or UTS at the creep temperatures. |
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